RADIATION FORCE IN THE MAGNETOOPTICAL TRAP

被引:166
作者
STEANE, AM
CHOWDHURY, M
FOOT, CJ
机构
[1] Clarendon Laboratory, Oxford University, Oxford
关键词
D O I
10.1364/JOSAB.9.002142
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
An overview of the theory of the magneto-optical trap is presented, along with measurements of the effect of an imbalance in the intensities of the trapping beams. This investigation tests the theory of the spring constant of the trap and confirms that the confining force at the center of the trap results from an induced orientation of the atomic ground state. The experimental results give the magnitude of this force, which has not yet been calculated accurately. We calculate the radiation field in the three-dimensional molasses, finding that the relative time phase of the orthogonal standing waves is significant, and we give some insight into the phenomenon of interference fringes when the beams are misaligned. We also discuss the limitation of the trapped atomic density resulting from photon scattering within the cloud, predicting that densities above 10(13) atoms/cm3 could be achieved in a trap operating at low saturation of the atomic transition. Finally, we briefly consider collisional loss at low densities, finding an especially large contribution from resonant dipole-dipole scattering.
引用
收藏
页码:2142 / 2158
页数:17
相关论文
共 39 条
[1]   MAGNETOSTATIC TRAPPING FIELDS FOR NEUTRAL ATOMS [J].
BERGEMAN, T ;
EREZ, G ;
METCALF, HJ .
PHYSICAL REVIEW A, 1987, 35 (04) :1535-1546
[2]   OBSERVATION OF CHANNELING OF ATOMS IN THE 3-DIMENSIONAL INTERFERENCE PATTERN OF OPTICAL STANDING WAVES [J].
BIGELOW, NP ;
PRENTISS, MG .
PHYSICAL REVIEW LETTERS, 1990, 65 (01) :29-32
[3]   DECREASED DAMPING OF ULTRACOLD ATOMS IN OPTICAL MOLASSES - PREDICTIONS AND A POSSIBLE SOLUTION [J].
BIGELOW, NP ;
PRENTISS, M .
OPTICS LETTERS, 1990, 15 (24) :1479-1481
[4]   OBSERVATIONS OF SODIUM ATOMS IN A MAGNETIC MOLASSES TRAP LOADED BY A CONTINUOUS UNCOOLED SOURCE [J].
CABLE, A ;
PRENTISS, M ;
BIGELOW, NP .
OPTICS LETTERS, 1990, 15 (09) :507-509
[5]  
CHU S, 1989, J OPT SOC AM B, V6, P2019
[6]  
CORNEY A, 1977, ATOMIC LASER SPECTRO, pCH8
[7]   LASER COOLING OF AN OPTICALLY THICK GAS - THE SIMPLEST RADIATION PRESSURE TRAP [J].
DALIBARD, J .
OPTICS COMMUNICATIONS, 1988, 68 (03) :203-208
[8]   LASER COOLING BELOW THE DOPPLER LIMIT BY POLARIZATION GRADIENTS - SIMPLE THEORETICAL-MODELS [J].
DALIBARD, J ;
COHENTANNOUDJI, C .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1989, 6 (11) :2023-2045
[9]  
DUSHMAN S, 1949, SCI F VACUUM TECHNIQ
[10]   LIGHT FORCES IN 2 CROSSED STANDING WAVES WITH CONTROLLED TIME-PHASE DIFFERENCE [J].
HEMMERICH, A ;
SCHROPP, D ;
HANSCH, TW .
PHYSICAL REVIEW A, 1991, 44 (03) :1910-1921